Adding dependency on cpopen formal package

Removing cpopen code from vdsm and using formal package instead

Change-Id: I6dfc943cbf7ac1e4c575069afca9c7df0624372f
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=903246
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20142
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Tested-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>